10 



BULLETIN 278, U. S. DEPARTMENT OF AGRICULTURE. 



parts of the tree by the use of a funnel-shaped canvas protector that 

 was placed over the limb being sprayed. 



The results of both bean and peach foliage tests are shown in 

 Table V. 



Table V. — Tests of the effect of various arsenicals on foliage of bean and peach. 



[Experiment started Aug. 31, 1912, Benton Harbor, Mich. Foliage examined for two weeks.] 



INJURY TO BEAN FOLIAGE. 



Name and dilution. 



Arsenate of lead, di. (powder), 1-50 



Arsenate of lead, tri. (powder), 1-50 



Arsenate of lead, di. and tri. (powder), 1-50. 



Arsenate of lead, tri. com. paste (1), 2-^0 



Arsenate of lead, tri. com. paste (2), 2-50 



Arsenate of lead, tri. com. paste (3), 2-50 



Arsenate of calcium; c. p. (powder), 1-50 



Arsenate of iron, c. p. (powder), 2-50 



Arsenate of iron, h. m. . T V-50 



Arsenate of zinc, c. p. (powder), 1-50 



Arsenate of zinc, h . m. , T V50 



Arsenic sulphid, 1-50 



Arsenic tersulphid, £-50 



Arsenic trioxid, £-50 



Arsenite of lime, h. m., 2 pts.-50 



Arsenite of zinc, powder (1) c. p., 1-50 



Arsenite of zinc (2), com. powder, f-50 



Arsenite of zinc (3),com. paste, 1J— 50 



Arsenite of zinc (4), com. powder, f-50 



Paris green, £-50 



Lime-sulphur, l£-50 



Poison used alone. 



No burning 



do 



....do 



do 



Moderate burning. 



No burning 



do 



. .do 



do 



do 



do 



Severe burning 



do 



do 



Moderate burning. 

 Severe burning. . . 

 Moderate burning. 



do 



do 



do 



No burning 



Poison combined 

 with lime, 2 to 

 50. 



No burning 



do 



do 



do 



do 



do 



do 



do 



....do 



....do 



do 



Severe burning... 



do 



Slight burning.. . 



No burning 



do 



....do 



....do 



....do 



Moderate burning 



Poison combined 

 with lime - sul- 

 phur, 1£ to 50. 



No burning. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Severe burning. 



Do. 



Do. 

 Moderate burning. 

 Severe burning. 

 Moderate burning. 



Do. 



Do. 



Do. 



INJURY TO PEACH FOLIAGE. 



Name and dilution. 



Poison used alone. 



Aresenate of lead, di. (powder), 1-50 



Arsenate of lead, tri. (powder), 1-50 



Arsenate of lead, di. and tri. (powder), 1-50 

 Arsenate of lead, tri. com. paste (1), 2-50... 

 Arsenate of lead, tri. com. paste (2), 2-50. . . 



Arsenate of lead, tri. com. paste (3), 2-50 



Arsenate of catMum, c. p. (powder), 1-50 



Arsenate of iron, c. p. (powder), 2-50 



Arsenate of iron, h. m.. T V50 



Arsenate of zinc, c. p. (powder), 1-50 



Arsenate of zinc, h. m., T V50 



Arsenic sulphid, 1-50 



Arsenic tersulphid, £-50 



Arsenic trioxid, £-50 



Arsenite of lime, h. m., 2pts.-50 



Arsenite of zinc, powder (1), c. p., 1-50 



Arsenite of zinc (2), com. powder, J-50 



Arsenite of zinc (3), com. paste, 1J— 50 



Arsenite of zinc (4), com. powder, J-50 



Paris green, £-50 



Lime-sulphur, 1J-50 



Verv slight burning. 

 No burning. 

 Slight burning. 

 No burning. 

 Severe burning. 

 Very slight burning. 

 Moderate burning. 

 No burning. 



Do. 

 Severe burning. 

 Very slight burning. 

 Severe burning. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Of the arsenates of lead, the diplumbic form had no burning effect 

 on bean foliage and burned peach foliage very slightly. Arsenate of 

 lead, consisting of a mixture of the diplumbic and triplumbic forms, 

 burned peach foliage slightly, but no injury resulted on bean foliage. 

 The commercial No. 1, consisting of the triplumbic form of arsenate 

 of lead, did not injure peach or bean foliage. The commercial (2) 

 burned the peach so badly that all the leaves were shed, and produced 



